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H. A. LACERDA.

STAY BOLT FOR BOILERS.

APPLICATION mm Patented May 27, 1919.

WVEIVTOR Ha 7A La;

A TTORNEYS UNITED STATES PATENT OFFICE y t i a i HARRY A. LACERDA, OF SCI-LENEC TADY, NEWYQRK, ASSIGNORiTG R. B. G. HAUGH'DON, OF PITTSBURGH, PENNSYLVANIA.

STAY-BOLT FOR BOILERS.

Application filed January 24,1917.

lie it known that l HARRY Aulmmlinm, :1 nitizen ol' the l nilml Slutes. HIHl u ri-ilienl ot' Soln-neetnrly, n the eonnty ol' Hehenew truly and Stiite oiwli'tr York. hav invented it new :Lnll lrnpiovetl i itnly liolt for lioilers o'l" whichtheiolhhi iug ifa zi full, (lean and exact description.

lhe invention relates to stay holte hirvinu a hall :inil"s( (;ltnt joint ennui-Lotion lietween the head (lfthe' lioltt'nnrl the plug or wlt'lVh Ferewing immtiwrimmhoiler eheet The ohjtiet of the present invention is to provirle a *n-w'smu improved slay lioll l'or boilers illl'uzngi-rl to ('Oltllfllhiflll' t r i-wprln Hiflll :llnl erintlnrl ion ol the holler -l i*ilto ineure l'rehflexingnrtion ol the alny' lroll n1 all times Fij keeping the hall nml H'l 'hell joint free of any Shale or other ext rnneom mutter. Another object ie to'perinit of conveniently screwing the bolt into the inner boiler sheet and sereWing'the-plug or leeve into the outer boile rsheet. l

In order-toh'ecomplieh' the ilesiired result. use is made of ntboltihnrl a pltifi, the bolt and plug having lj'alhanilstieltet joint eonneie tion and t'li '5'. 'i'iti belinrifl eoeketjoint Torrhing a eireiiiatinfg pttth'sigWor wineor steam to keep tht' o'fcll luncl socket joint free of extraneous mattthi ziiid ih elefnin. netire onrlition.

A prnetieal ernhorliment ot th in enti n ir= represented in the ner'onrpntirin lruu' loge forming ii port of the "lnw'itiizition. 1r \\lllltll similar ulizlrueterh of lt'lllt'lilfl inili' eate eorrespondingparts in all the views.

Figure 1" it a sectioiial side elevation of the stay bolt ashpffliefltlnd showing the bolt proper in eevalliiorig' l Fig. 4 H?! seetioliul si'rie elevation of a modified form of'the st ajg' holtf with the holt proper sxhdt ii inelir'atih'n'; L

Fig. 5 is teroee section of the same 'onthe line 55 ofFig'. 4; and

Fig. 6 iWifflcevieW of the cap knew in Fi 4 :ll! '1? (H The bolt 10 ispro'i ilti n its' inher erirl With serewi' 'thiehds' '11"eerewitit into the in-' ner boiler sheet 12% tm'tia hen'ii'13 it formed after the tiolt'is sorewelin lahe'ttiprerent unscrewingi'of 'theholt. T e outer enii of Specification of Letters Patent.

Patented May 757, HHSJ.

Serial Nov 144,210.

the holt lt) i1 proviilril with u hrznl l'orineil ol' nnliul pioj'erli'oim ll. \i'hieh I'orin u ln-inl whieh is erueit'orni in erose section. 'l'lnexterior mil'lifeesWfl" these projeetione :n'r Spherical :iml fire lfilllll onfi'sphel'iml -i-ui 15 formed interiorly on :1 plug or a sleeve ll; IH'UVldWl with an exterior threuil 1T wrew ing into the outer hoiler Hheet 18. The plug 10 is ('lOHIfl by :1 (mp 20 or 21 ot' whirrh the cup 20 is srrewed on the 'outer (l'ltl of the exterior Serefw threiiil 17 while the rap 2! (Her l "|;1". 1)i Hem-Well onto on interio try-n llll'ttlil 2i! l oln'n-ll mi tlnlIIHlllt ol' the plug; 17 ll i1-1 lllltlPl'HllllHl that the rup it! i" not in wow the outer (n l i the plug l rn l l y inl the lure oi the ll rllll' --lir l lflulnl in thi:--v (2114* the mp 20 i1= |n'o nlil \Yllll no r li'l'ini polygonal portion 22% for engagement by wrench or other tool to HCT(\\ the rup in place. The inner enrtu e of the rup 20 i:-; provided with a spherical recess; 24 mneen trio to the spheriel'tl ehnpe of the head 14 to form a passage With tlhet'siime and thus 211 low water or steam to pass around the head 14 with u' view to preventsettle or other extraneous matter frorn ihdg'in between the heed and theea Qtl orin the faint hetw eei'i' th'e heml 14 a'nd he'soclret T5. The cap 21 is used in enee the outer face of the plug 17 is flush with the outer faoe of the boiler sheet 18 HR plainljv shown in Fig.4. and in thi euee the outer tore of the (up 2] i pro vided with n polygonal reeess Qfitor the up plieution oi it euituihletool to screw the cup 21 into position in the plug 17 or to unscrew it therefrom Whenever an inspection is to be mide. The"soclzet 15 is protitled with :r

' "lumlity of notches or grooves 30 which" it U orrn passages for the Water or ste'mn to the joint between thelhead 14 end the: socket 1 5, and the said notches are{adapted to be" enveniently eere'win the ilug 16 into p'si'tion in the outer boiler she 18 w ithoiitilain g'rer of injuring the eocket 15.

From the foregoing it will be seen that by the arrangement described, thbolt 10 c stn be readily screwed into the innrh oiler sheet L member is not only important in permitting the circulation of water and steam to keep the ball and socket joint free of extraneous matter and in a clean active condition, but it also has another highly important function in that it enables the workmen to read ily see that the head of each bolt is perfectly seated on the sleeve member when the bolt is put in place. This has not heretofore been possible with any bolt of this type, since the spherical head necessarily prevented any inspection of the character of its seating. It has frequently been found that a considerable percentage of stay bolts are not properly seated in the first instance and are therefore useless, the strain being thrown on adjacent bolts. By my construction, and especially with a spherical head of the cruciform shape shown, opportunity is given to accurately determine the initial seating of each bolt head before the cap is screwed on. The form of the head may, however, be widely changed and still provide the necessary inspection opening or openings.

It will further be seen that the plug 16 can be readily screwed in place without in jury to the threads 17 or the socket 153. \Vhen the several parts are in place a circulating passage is formed between the bolt head 14 and the cap 20 and likewise with the joint socket 15 to prevent lodging of any scale or extraneous matter between the spherical face of the head 14, the cap 20 or 21 and the socket 15 thus keeping the stay bolt at all times in proper flexible condition without danger of breaking such stay bolt in case its head should be prevented from turning in the socket on account of hardened scale or the like. By keeping the contacting faces of the socket 15 and the head 14- in proper condition the stay bolt readily coinpensates for expansion and contraction of the boiler sheets 12 and 18.

The bolt 10 is provided with a. tell-talc opening {10 extending through the major portion of the length of the bolt, but terminating short of the end surface of the spherical head, and hence in case the bolt should break for any reason whatever Water or steam can flow out at the inner end thus calling attention tothe defect and without requiring the usual periodical removal of the cap 20 or 21 at the outer end of the bolt 10.

Having thus described my invention, I claim as new and desire to, secure by Letters Patent 1. A stay bolt for boilers andlike struc tures, comprising a bolt and a socket member, the said bolt and socket member having a. ball and socketzjointconnection, one of said members having a circulating passage for water or steam, to keep the ball and socket joint free of extraneous matter and in, clean active condition.

'2. A stay bolt for boilers and like structures, comprising a bolt adapted to be held at one end in one boiler sheet, a sleeve adapted to engage the other boiler sheet, the other end of the said bolt and the said sleeve forming a ball and socket; joint with each other one of said members having an opening forming a circulating passage'for the water or steam in the boiler to keep the ball and socket joint free of extraneous matter and in clean activecondition.

A stay bolt for boilers and like structures, comprising a bolt adapted to be held at one end in one of the boiler sheets and provided at the other end with a head, and a plug screwing in the other boiler sheet and having a socket engaged by the said head, the said socket and the said head having passages for the circulation of water and steam.

4. A stay bolt for boilers and like structures, con'iprising a bolt adapted to be held at one end in one of the boiler sheets and provided at the other end with a head, a plug screwing in the other boiler sheet and having a socket engaged by the said head. the said socket and the said head having passages for the circulation of water and steam, and a cap screwing on the said plug and forming with the said head a passage in communication with the passages of the head.

5. A. stay bolt for boilers and like structures, comprising a bolt adapted to be held at one end in one of the boiler sheets, the bolt having at its other end a spherical head provided with passages, and a plug adapted to screw in the other boiler sheet, the plug having an interior spherical socket on which the said head is seated, the socket having passages, the passages in the bolt head and plug cooperating to form means for circulation of water and steam to thereby keep the ball and socket joint free of extraneous mat ter and in clean, active condition.

6. A stay belt for boilers and like structures, comprising a boltand a socket memher, the said bolt and socket member having a ball and socket joint connection, and one of said members having a circulating passage for water or steam to keep the ball and socket joint free of extraneous matter and in clean active condition, the bolt having a telltale opening extending throughout the major portion of its length. r z

7. A stay bolt for boilers and like structures, comprising a plug having a spherical interior socket and adapted to screw into one boiler sheet, and a bolt adapted tobe fastened at one end to the other boiler sheet, the bolt having a head cruciform in. cross section with the exterior surface ofospherical shape and seated on the said socket.

8. A stay bolt ,for boilers and like StIllG-z tures provided with a bolt. threaded at one end to screw into a boiler sheet, the bolt having a head cruciform in cross section adapted to be engaged by a correspondingly shaped tool to turn the bolt and screw the same into the boiler sheet.

9. In a stay bolt for boilers and like structures, a tubular plu threaded exteriorly to screw into a boiler sfieet, the plug having an internal socket provided with passages for engagement by a tool to screw the plug into the boiler sheet.

10. In a stay bolt for boilers and like structures, a plug provided with an exterior and an interior screw thread and having an interior socket, a bolt having a spherical head cruciform in cross section and seated on the said socket, and a cap screwing in the said plu and having a polygonal recess for the app ication of a tool to screw the cap in place in the plug.

11. A stay bolt for boilers and like structures, having a threaded portion at one end adapted to screw into a boiler sheet, the other end of the bolt having a radial projection which is provided with a spherical surface to form a seat engaging portion for the head, said projection being shaped to be engaged by a correspondingly shaped tool to turn the bolt and screw the same into the boiler sheet; substantially as described.

12. A stay bolt for boilers and like structures, comprising a bolt and a socket memher, the said bolt and socket member having a ball and socket joint connection, there being an opening between the head portion of the bolt member and the socket member through which the seating of the bolt may be seen, and said socket member having a removable cap portion giving access to said opening.

13. A stay bolt for boilers and like structures, comprising a bolt member and a socket member, the two members having a ball and socket joint connection, and the bolt head having a plurality of cut away portions which intersect the bearing surface of the joint, and which provide a plurality of openings through which the seating of the bolt may be inspected, said socket member having a removable cap portion giving access to sald cut away portions.

14. A stay bolt for boilers and like structures having a threaded portion at one end adapted to screw into a boiler sheet, the bolt having a head at the other end formed of a plurality of radial projections having angular side walls and spherical surfaces to form seat engaging portions for the head, said angular side walls being adapted to be en gaged by correspondingly shaped tools to turn the bolt and screw the same into the boiler sheet.

HARRY A. LACERDA.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

